Propeller mounting



Nov. 12, 1929. R. T. svENDsEN TAL 197359560 PROPELLER MOUNTING Filed April 30, 1928 3 Sheets-Sheet l DAV/ D 6. CHANDLER Bmp,

A bborneg Nm 12, 1929, R, T SVENDSEN ET AL 1,7%660 u PROPELLER MOUNTING Filed April 3o, 1928 5 Sheets-Sheet 2 [n Ven wijs l ROSEHT 7T VENDSEN' DA VID 6. @HANDLER A 27a-off: gays- Novc 12, :92a

R. T. SVENDSEN ET AL.

PROPELLER' MOUNTING Filed April 30, 1928 3 Sheets-Sheet 5 Inventors ROBERT- 7." h/ENDaENv DAV/D G. CHANDLER Abborney Nov. l2, i929 nonnnr fr. svENDsEN AND DAVID e. CHANDLER, or MINNEAPOLIS, innmnse'ra i PROPELLER MOUNTING apiiiicaaon mea apra so,

This invention relates 'to new and useful limprovements in propeller mountings, and

an object of the invention is -to provide such yan apparatus adapted to be mounted at the rear end of an ordinary boat or vessel, and

comprising l'a supporting member normally depending into the water and having a propeller journaled at the lower end thereof, and

the mounting. being adapted to swing 1n subv stantially ajvertical plane, whereby the pro-l pellermay be elevated to 'an inoperatlve position. y

A further object of the invention is top rovide a propeller mounting adapted to swlng upon an axis arranged transversely of the boat, whereby the mounting may be vertically adjusted to change the position of the propeller inthe water, and a strut having one end connected with the lower end of the .20 mounting and normally positioned to be engaged by an4 obstruction inthe water and to Yautomatically elevate the propeller and its mounting to prevent the latter from engaging the obstruction.

A further object is to provide a propeller mounting comprising a supporting member having a propeller journaled in the lower end thereof, and thevlower end of the mounting being adapted to swin l axis, whereby the prope ler may be adjusted to guide the vessel through the water, and also whereby the movement of the vessel may be reversed. p

A further object is to provide a propeller mounting comprising a propeller supporting member havingone end secured to an engine and havinga propeller journaled in the opposite end thereof and adapted to be positioned beneath the bottom of the vessel, and the engine being'mounted for' pivotalA movement upon an axis arranged transversely of the vessel, whereby the propeller and 1ts mounting may be swung to a position out of the water or above the bottom of the vessel so as to prevent the propeller from striking the lakev bottom and other obstructions.

A further object is to provide an apparatus of the class described, wherein the engine and propeller mounting are; connected together as a unit, and the unit is pivotal'ly mounted about an upright y with the lower end of the propeller support- 1928. 'Serial No. 274,027.

within the boat and projects through the rear wall thereof, and the relative location of `the propeller with respect t0 the pivot, upon which the unit is. mounted, isA such thatl the propeller will eectively propel the boat while the strut rides on the lake bottom, the raising and lowering of the propeller not materially changing the effectiveness of the propeller.. l j

A further object resides in the particular arrangement of the driving connection between the engine. and propeller, which includes 'a drive shaft, an intermediate shaft, and a propeller shaft, geared together in such a-manner, with respect to the angle of the propeller blades, that the propeller constantly tends to rotate or swing about the axis of the intermediate shaft, but is locked` against such movement byy a suitable lock adapted for manual operation.

Other objects of the invention reside in the pivotal mounting of the propeller supporting member and engine in the boat or vessel; the means provided for swinging the propeller about'an upright axis to control the steering of the vessel and its movement forwardly and backwardly; the means provided for manually adjusting the position of the propeller; the strut having a pivotal connection ing member and having a pivotal sliding connection with the bottom of the vessel, and normally positioned to be engaged by an obstruction lnvthe water, whereby it will be moved upwardly and lift the pro eller out. of the path of such obstruction.; t emeans provided for manually raising and lowering the propeller-with respect to the boat; themeans provided for preventing leakage4 at the point where the propeller mounting projects through the rear wall of the boat; the construction of the steering mechanism; the particular arrangement of the controls with respect to the axisrof the pivots supporting the mounting, whereby foreshortening of the connections is prevented, when raising and lowering the propeller; the relative location of the axis about which the engine and propeller mounting swing, with respect to the propeller, which is such as to prevent the probeen disclosed a structure desi v it is to be understood that the invention is' not eonned to the exact features shown as various changes may be made withinv the scope.

n part ofthis speclfieation;

peller from liftin when operating to reverse the. movement o? the boat, andy which also Ifunctions to eliminate excessive strains from the rear end of theboat, should the propeller be shifted into reverse while the boat is j traveling forwardly aty high speed; and, in the general construction of the apparatus, as awhole.

` The lparticularl object of the invention,

therefore, is to providean improved propeller mounting. y

Other objects of the invention will appear from the following description and accompanying drawings andvwillfbe pointed out in the annexed claims. y

In the accompanying drawings, there has ed to carry out the various objects ofthe invention, but

of the claims which follow.

, In the accompanying drawings forming Figure 1 is a vertical sectionalyiew showing the rear portion of a boat or vessel, with the invention applied thereto;':-

Figure 2 is a view similar to ,Figure 1, but showing the propeller elevated tola posltion substantially above the level of the bottom of the boat;

Figure 3 is a detail sectional view on the line 3--3 of Figure 1, showing the means i provided for adjusting the position of the ing shaft is likewise mounted for swinging movement in a vertical plane, and showing 1t rconnected to twin engines; and

Figure 9 is a detalled sectional view on i the lines 9--9 of Figure 8.

Q In the selected embodiment of the invention here shown, there is illustrated, for purposes of disclosure, the rear portion 1 of an ordinary boat orvessel,'having brackets 2 secured thereto and provided with pivots 3 adapted to pivotally support an engine 4, as shown in Figures 1 and 2.

The propeller supportinor means comprises a casing 5, prefere ly tu ular, having one end detachably connected tothe engine 4 and having its outer end terminating in a transmission housing 6, best shown in Figure 1. The tubular casing 5 is secured to the engine jby suitable bolts 7. A hub 8 is preferably integrally formed with the bottom 'of the gear housing 6, and has a sleeve 9mountf ed for .rotation therein, Vasshown in Figure 1,.

The upper endy of this sleeve has a headA 11- seated against the annular seat or face '12 v of the hub ,8, as shown in Figure 1. lA member 13 is secured `to thesleeve 9 by such meansv as a cap screw or bolt'14 which, it will be noted, is mounted in the wall of the menn- -ber 13 and has its inner.I end reeelved In threaded engagement ith the lwall of the sleeve9. Thus, it will bl noted that the member 13 and the housing 15,'y at the lower end,v

thereof, areI mounted for swinging movement about the aXis of the sleeve 9.

A driveshaft 16 is rotatably mountedi-n a sleeve 17, mounted for rotary movement in bearings 18 and 19, provided inthe tubu lar casing 5. 'The sleeve 17 has a head 21 seated against the face 22, provided at one end of the casing 5,. as shown in Figure 1. One end of the'shaft 16 'is operatively connected with the engine crank shaft 23 by means of a suitable clutch4 24, operable by a elutchlever 25, havingV a rod 26l leading therefrom tol the drivers seat, usually provided 4at the forwardend ofthe boat. The rear :end of the drive shaft 16 has a beveled pinion 27 ysecured thereto which constantly meshes with a bevehgear 28, terminally and non-rotatably `secured to the up er Iend ofan intermediate shaft 29. LA 'beve pinion 31 is secured to the lowerend of the intermediate shaft 29 and meshes with a pinion 32, se-

cured to the propeller shaft 33, having a propeller 34 mounted thereon as shown in Figure 1. The propellershaft 33is supported in a suitable anti-friction bearing 35 and a sleeve bearin 36. Suitable take-up washers 37 are provided adjacent the sleeve bearing 36 to take up end play of the propeller shaft 33. A cap 38 is provided in the lower housing l5 whereby access may be had y to the interior thereof. The screw 14 securely locks'l the member 13 to the sleeve 9 so that the propeller 34 will be swungabout the axis of the intermediate shaft 29, when the sleeve is rotated. The-weight of the propeller andA its associated parts will be carried by the head l11 of the sleeve 9 engaging the' upper face 12 of the hub 8 of the transmission housing 6.

Means are provided for relatively swinging the propeller about the axis of the shaft 29 to guide the boat in its course.

Such

means comprises a gear segment 39 rotatably mounted upon the-head 11 of the sleeve 9.

The segment 39 meshes with a relatively smaller segment 41, vterminally providedy upon the sleeve 17, mounted in the' tubular easing l5. A'spiral gear42 .is keyed to the opposite end of the sleeve 17 and meshes with a similar gear 43, secured to a short shaft 44 mounted in suitable bearings as segment 39 by -47 are so located that the points the casing 45 shown in Figure 4. A flanged pulley or wheel is secured to the shaft 44 adapted to have a cord or cable 46 coiled thereabout, the sections of which pass undersuitable guide pulleys 47 Ishown in Figure 2." `The pulleys of contact of the cables therewith, will be substantially in alinement with the axes of the pivots 3, thereby preventing shortening or lengthening of the cables 46, when the mounting is vertically adjusted.

An important feature of the invention resides in the/means provided for shifting the propeller into forward an'd reverse positions. Such means is shown in Figures i, 3, and 5 and comprises a plate '48 having a central opening 49 adapted to receive the head 1l of the sleeve 9. Abutments 5l are provided in the walls' of the opening V49 adapted to be engaged by a detent52, provided on one side of the head l1, as particularly shown in Figure 5. The plate 48 is rotatable with the gear v means of the pins 53 secured in the segment 39 and traversing slots 54, provided in the plate 48 as shown in Figures 3 and 5.

A curved fslot 55 is provided at one `end of the plate 48 and has one end of a rod 56 engaged therewith which` is slidably mounted in a bearing provided in the wall separating the interior of the tubular'casing 5 from the interior of the gear housing 6. The 'opposite end of the rod 56 is pivotally connected with'an arm 57, pivoted at 58 to the wall of and depending therefrom as shown in Figure l. A control rod 59 has one end connected to the arm 57 and its opposite end to a link 61, pivoted at 62 to one of the with the abutment which corresponds to the ,osi-y brackets 2. The axis of the pivot 63 connectingthe link 6l with the rod 59 is substantially alined with the axes of the pivots 3, supporting the motor 4l and the propeller mounting, so that tilting movement mounting upon the pivots connected with the rod 59 'and link 61 and extends forwardly to the opel-atene seat.

ln Figurey 5, the detent`52'isshown engaged 5l "at the'right hand side of the figure,

' tion of the-associated parts'as shownin Ligure ;.1. g en the plate v48 is'moved rearwardly the abutmentml at the 4right,'hand side of Figure 5 will be moved out of engagement ,with the detent 52, Awhereupon the torque of the shaft 29 will immediately rotate the propeller housing lof-'a half revolution, or until the abutment 52 en ages the abutment at y the left hand side of Figure 5, thereby arresting further movement of the housing l5 and, therefore the propeller 34. Thel head stantly tends to rotate in the 'direction indi- --cated by the arrow in Figure 5, so that each timje'thefplate 48 is movedfrom one position yofthe motor and l 3 will notchangeIl the adjustment of the plate '48. A rod 64 is' 11, carrying the detent 52, .con`YA to the other', the propeller and the housing 15 willfbe rotated a halfrevolution'about the airis ofthe intermediate shaft 29." When the propeller is positioned as indicated in dotted lines in Figure l, the boat will be moved in a rearward direction, and, when positioned as shown in full lines in Figure l, the boat will be moved forwardly when the propeller is operated. rlhus, it will be seen that the forward and rearward movements of the lboat is controlled entirely by movement of the control rod'64.

Another feature of the invention resides in the provision of th'e strut 65, shown hilfigures l and 2. rlhis strut, it will be noted, has a ball-and-socket connection 66 with the lower portion of the housing l5 and has its upper `wardly to the position shown in Figure 2,

thereby preventing the propeller from striking the lake bottom or coming'in direct contact with obstructions, such as logs or stones, reposing at the bottom Vof the lake.-

A'cable 69'hasone end connected to the tubular casino 5 and passes upwardly over a sheave or pulley 7l, thence forwardly to the operators seat. Ilihis cable provides means for manually elevating the propeller as shown lin Figure 2. A second cable 72 is connected with the bottom of the 'casing 5 and passes 'under a pulley 7 3, secured tothe bottom of the boat and thence forwardly to the operators seat. This cable provides'means for forcibly holding the mounting and propeller in the position shown in lfigure l, when the propeller is operated 'in reverse, as indicated in dot-ted lines'in Figure' l, and particularly when Astartingthe vessel when heavily loaded, Under ordinary conditions, 72 are left suciently slack` to allow the propeller mounting to be oscillated by the strut 65, shouldthe latter engage an obstruction inthe water. A .coverplate T4-is detachably Secured-tothe gear housing 6 so that access jmay be-had tothe interior thereof.

` Referring A.to Figures l and 2, it will] be noted -that the tubular 'casing 5, in this instance, projects through the rear wall 20 of the boat, and to permit vertical movement of the casing with elongated opening 30 is provided therein as shown. To prevent leakage between the cas- I ing/5 and the Vslotted opening in the rear wall of the boat, a plate 40 is' slidably mounted in uides 50 secured tothe rear w`all 20, as shown 1n Figures, 6 and 8. The/plate 40 has a relatively shorter elongated opening 60 adapted the cables 69 and respect tothe wall 20, an

to receive the casing 5 and to permit vertical movementof the casing thereins #Asecond plate 70 has an aperture adapted to snugly receive the casing 5, as shown in Figure 1. This plate is movableffwith the casing and is supported in run-ways provided in the guides as shown in Figures 6 and 8. The joint between the plate 70 and the casing -is provided with suitable packing, notshown, to

prevent leakage.

Figures 6 and 7 illustrate a modified for wherein the engine 7 5 is fixedly, mounted in the boat and the tubular casing 5 is pivotally connected thereto by suitable pivots 7 6. The drive shaft 16 'is provided `with a universal joint 77 so thatthe mounting may be vertically adjusted operated.

t Figures 8 and 9 illustrate another modified form wherein twin engines78 are employed instead of a single engine, such as shown in Figures 1, 2, 6, and 7'. InthisinStanCe, the

tubular casing 5 is shown as having a gear housing 79 provided at one end thereof and. pivotally connected to the crank shafts 81 of the engines 78. A spiral gear .82 .is secured to the crank shafts 8,1 and meshes with asimilar gear 83, secured tothe drive shaft 16.Y In

.the form here shown, the engines 78 are also stationary and the propeller mounting, including the tubular casing 5', will swing about the axis of the engine crank shafts 81.

`We have found that by mounting and operating the propeller `as shown and described,

in this application, tlieboat may be conveniently operated in shallow water, as the strut ositivelyl prevents the propeller from stri ying objects in thewater and, likewise,- it prevents it from striking the bottom when the boat is cruising in shallow waterl Also, by mounting the propeller ahead of the housing 15 and member 13, it is rendered more effectivethan when mounted back of its 'supf porting means, as lis customary in most propeller mountings.-l The boat may be conveniently guidedin the water by sim ly manipulating the cable sections 46 to shghtly oscillate the propeller, thus dispensing with the- 'use of a rudder.

The o eration of reversing the movement of the oat 1n' the water is also very simple and'positivein operation,-

it being only necessary to shift the position 4horizontal, when.' t

reverse osition. lBy mlnimizing this angle,

the ten ency of the ypro eller to lift, when be lessened. We

of the plate 48, whereupon the torque of the intermediate shaft 19 will immediately swing the propeller from its forward to its reverse position, indicated in full and dotted lines, respectively, in Figure 1. It will also be noted that the pivots 3 supporting the motor 4, are located comparativelyclos'e to the bottom of the boat so as to decrease the pulling angle of the propeller with respect to the e propeller is operating inoperating in reverse, W1

while the propeller isbeingl in reverse have also found that by thus mounting the propeller and-its operating means in the boat, the` propeller may be shifted into reverse when the boat `is moving forwardly in the water without danger df imparting ex-y cause of the fact that the propeller and its cessive strains to the rear end of the boat, be.

supportingl means will tend tolift in the water l when thus suddenly 'thrown from vforward to reverse, v

The apparatus as shownI inFigures 1 and 2, may be assembled asa unit -and installed in a boat within a Icomparatively short length .of time. The structuresshown in Figures 6 'to y9, inclusive, are adapted for larger vessels wherein heavy motors are used. whichm'ay. be too lheavy to tilt to the position shown Figure 2.

`YVe'claim as our invention: 1. In a propeller' mounting for boats, the combination of a supporting member having ashaft journaled in'one end thereof, a pi-V' otal support within the boat for said mounting, a propeller secured to said shaft and off set from the longitudinal centerline of said mounting and having its axis arranged substantially parallel to said center line,lsaid' pivotal support being located a suitable dis;

tance forwardly of the propeller'to cause the y mounting, `when the propeller is operating osition and under normal conditions, vto substantially" retain itsnormalf position, but when subjected to an abnormaly load, while in reverse, said mounting and propellery vwill automaticallylift to relieve the parts of excessive strains.

2. Ina propeller mounting for boats,the combination of a supporting member having a shaft journaled at one end thereof, a propeller secured to said shaft, a pivotal support yfor said member located'within the boat, the

posite end of said strut having a movable connection with-the bottom of the boat, said strut providingfa guard for said propeller,`

when cruising in shallow water, and also functioning to automatically elevate the propeller and mounting when said strut engages an obstruction in the water.

3. In -a propeller mounting for boats, the combination of a supporting member having a shaft journaled at one end thereof and having a propeller secured thereto, a pivotal ino meaeeo having one`end pivotally connected to said supporting member below and adjacent to4 lsaid propeller shaft, and the opposite end of said strut having a movable connection with between the'axes of the pivotal thebottom ofthe boat, said strut extending downwardly` beneath the propeller and providing a guard therefor, and also functioning to elevate the propeller and mounting when said strut engages an obstruction in` the water, and the distance between the axis of said pivotal support and the medial plane of the propeller being 'greater than the distance support and 'said propeller.

4. In a propeller mounting, tion of a supporting member,

the combinaa pivotal support for one end of saidmember located in p a boat, a shaft journaled in the opposite end of said supporting member and having a prop peller secured thereto and adapted for swingn lai plunder.A an abnormal load the ing movement in a vertical-plane, and said pivotal support being located forwardly of and above the axis thereof', the distance between the axis of said pivotal support and the medial plane of the propeller being greaterthan the distance between the axes of the pivotal support and the propeller, whereby said propeller mounting will retain a substantially normal operating position, when the propeller isy operating in reverse and with a substantially normal load, and whenoperating in reverse propeller may lift to a more ineective position in the water to relieve the parts ofl excessive strains.

5. 'In a propeller mounting, the combination of` a supportin member, a pivotal support for one end o saidmember located in `a boat, a shaft'journaled in the opposite end of said supporting member andi having a pro# adapted for swingpeller secured thereto-v and 5l ing movement ifnya horizontal plane, lto guide the boat, 'said pivotal support being located forwardly of and above said propeller, whereby .said propeller mounting willretain a subparts of excessive strains,

eafpending therefrom,

stantially normal yoplerating yposition, `when lthepropeller isoperating in reverse and with' hen operating in reverse d, and l d load, j :said propeller;- is

effective position in N"ther,water tto yrelieve :the d and a strut having its forward end movably'connected withthe boat bottom, extending vfrom beneath the propeller and having its rear end pivotally connected with the lower ortionof the supportingmember. .4 l 6. In a propeller mounting, the combination of a casing adapted for connection with an vengine mounted within a boat, a member'rotatably connected with said casingand I a propeller journaled inthe lower end of said-member, `means op:

' engine,

cpnnection between downwardly theresaid propellerwith the engine,

erativelyconnecting the propellerwith the engine, and means for rotating said member to swing the propeller Kwith respect to said A casing to yguide the boa-t, said casing and member beingmounted for swinging move-y ing and depending therefrom, a shaftjournaled in the lower end of said member and having a propeller mounted thereon, means operatively connecting the'y propeller shaft l a, member rotatably connected with said cas' the combinar,

with the engine, and means for rotating said member to swing the propeller shaft in/a lane substantially parallel to the longitudinal center-line of said casing, whereby the ropeller may be adjusted to guide the boat. 8. A propeller mounting comprising a casing adapted for connection with an inboard one end of said casing projecting through the rearwall of the boat and having a hub depending therefrom, a member rotatably connected with said hub and having a propeller journaled in the lower endr thereof, means operatively connecting said propeller with the engine, means for retaining said member in adjusted positions, and means for releasing. said member, whereby the torque of the driving connection 'between the propeller and engine willy cause t to be rotated a half revolution to reverse the direction of movement of `the boat.

n 9. A propeller mounting'comprising a casing adapted the rear wall of the means for partially rotating said member to swing the'propeller with respect'to said casing to guide the boat, and means for tempo# rarily releasing said member from said control means, whereby the torque of the driving the propeller andengine will cause the member to be rotated a half revolution to reverse Athe direction of movement of the boat.

10. A propeller mounting comprising a cas ing adap d for connection with an engine 'mountediw'ithin a boat, one end of said casing projecting through the rear wall of the boat and having a hub depending therefrom, a member rotatably connected with said hu and having apropeller j ournaled in the lower end thereof, means operatively connecting agear segment operatively connected Iwith said member,

means for manually actuating said gear seg' ioo for connection with an engine mounted within a boat, one end of said casting projecting through boat and having ahub depending therefrom, a member rotatably connected with said hub and having apropeller' journaled 'in the lowviis ment to partially rotate said member to swing V lthrough the rear wall ofthe boat(i a gear housing terminally provided on sai casing, yand having a member rotatably connected there with and depending therefrom, a propeller journaledin the lower end of said member, a drive shaft in said casing connected with the engine, an intermediate shaftoperatively connecting said drive shaft with said propeller,

and said propeller-supporting member being4 y adapted for swinging movement in a plane substantiall parallel to the axis of said drive shaft to gui e the boat, and the propeller-supporting en d of saidmounting being adapted to swing in a vertical plane to raise the propeller to a higher position, in the water, whereby the propeller may clear obstructions.

. 12. A propellerlmounting com rising an engine adapted to be mounted wit in a boat,

' a casing connected therewith and projecting through a wall of'the boat, adgeary housing terminally provided .on said casing and hav- `ing* a member rotatably connected therewith and depending therefrom, a `propeller jourf Inaled in the lower` end of said member, said casing, housing and member being adapted for vertical movement to relatively adjust the Ipropeller in the water, a drive shaft in said casing connected with the engine, an intermediate shaft operatively connecting said drive shaft and propeller, said pro eller supporting member being adapted or rotary movement in a plane substantially parallel to the axis of said drive shaft to guide--t-heboat.

13. A ropeller mounting comprisin an engine a apted to be mounted within a heat a casing connected therewith and projecting through a wall of the boat, a gear housing terminally provided on said casing Vand hav* ing a member rotatably connected therewith and depending therefrom, a, propeller journaled in the lower end of said member and normally positioned forwardly thereof, a drive shaft in said casing connected with the engine, an intermediate'shaft operatively connecting said drive shaft with the propeller, and a strut connected with said member and the boat and normally positioned to be engaged by anobstruction in the water to protect the propeller and to automatically left the propeller over such obstruction.

14. A propeller mounting comprising an engine havinga casing connected therewith and adapted toproject through a wall of a' .boat,.a gear housing terminally provided in the casing',la member rotatably connected with' Said housing and depending therefrom, a pro-l peller j ournaled in the lower end' of said mem.4 ber, a drive shaft" in said casing connected with the engine, an intermediate shaft mount- 'ed in said housing and member and having geared connections with said drive shaft and v propeller shaft, the torque/of the intermediate shaft constantly tending tol rotate said meml- 'ber with respect to said housin-g,' means for manually partially rotating saidXmember to ments and a-detent for lockin the propeller.

supporting member in either orward or re-` verse positions, and means for releasing said detent from said abutments, whereby the f 15. Ay propeller mounting comprising an engine adapted to be ,mounted within a boat, a casing connected therewith and projecting` through an aperture provided in the rear walll of the boat, a gear housin terx'nin'allyprovided on'said casing and aving a member rotatably connected therewith and ydepending therefrom, a propeller 'journaled in the lower end of said member, said casing being f adapted for vertical movement to relatively adjust the position' of the propeller in the water, a drive shaft in said casing connected said -propeller.

with the engine, and an intermediate shaft operatively connecting said drive shaft with los' engine adapted to bei'munted within a boat, a casing connected therewith andeprojecting.

through an aperture provided in the rear wall of the boat, a gear housin terminally provided on said casing and having a member rotatably connected ytherewith and depending therefrom, a propeller journaled in the x lower end of said member, said casin being.

, adapted for vertical movement in said boat wall to relatively adjust the -position ofthe propellerin the water, a driveshaft in said vcasing connected with the engine, an intermediate shaft operatively connecting said drive shaft with said propeller, and said propeller supporting member' being adapted for swinging movenent to provide means for` guilin the boat in the water. 4

1 aperture in the rear-wall thereof, of a pro-.` peller mountino' comprising a casing having he combination with a boat having an one end pivotal-ly supported within the boat and connected with an engine, said casing traversing the aperture in said rear boat wall,

andhaving a depending portion located exchangel the position ofthe propeller with re- 4 'spect to the housing and for controlling move-vv ,ment of the boat in the water, spacedI abut-j eratingvwith means on said rear boat Wall to teriorly of the boat, a 'propeller mounted. in said depending portion, 'and said casing be ing adapted for up-andedown movement in said aperture to relatively `adjust the position of the propeller in the Water.

18. The combination with a boat having an elongated aperture in the, rear Wall thereof',- of a propeller mounting comprising a casing having one end pivotally supported Within the boat and connected with an engine, said casing traversing the aperture'insaid rear" Ahoat Wall and having-a depending portion located exteriorly of the boat, a propeller mounted in said depending portion, said oasing being adapted for lip-and-down movement in said aperture to relatively adjust the position of the propeller in the Water, and means movable with said casing and coopprevent leakage around said casing.

In Witness whereof, We have hereunto set our hands this 28th day of April, 1928.

ROBERT T. SVENDSEN. DAVID G. CHANDLER. 

